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<?php |
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declare(strict_types=1); |
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namespace BitWasp\Bitcoin\Crypto\EcAdapter\Impl\Secp256k1\Serializer\Signature; |
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use BitWasp\Bitcoin\Crypto\EcAdapter\Impl\Secp256k1\Adapter\EcAdapter; |
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use BitWasp\Bitcoin\Crypto\EcAdapter\Impl\Secp256k1\Signature\CompactSignature; |
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use BitWasp\Bitcoin\Crypto\EcAdapter\Serializer\Signature\CompactSignatureSerializerInterface; |
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use BitWasp\Bitcoin\Crypto\EcAdapter\Signature\CompactSignatureInterface; |
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use BitWasp\Buffertools\Buffer; |
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use BitWasp\Buffertools\BufferInterface; |
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use BitWasp\Buffertools\Parser; |
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class CompactSignatureSerializer implements CompactSignatureSerializerInterface |
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{ |
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/** |
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* @var EcAdapter |
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*/ |
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private $ecAdapter; |
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/** |
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* @param EcAdapter $ecAdapter |
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*/ |
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public function __construct(EcAdapter $ecAdapter) |
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{ |
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$this->ecAdapter = $ecAdapter; |
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} |
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/** |
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* @param CompactSignature $signature |
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* @return BufferInterface |
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*/ |
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private function doSerialize(CompactSignature $signature) |
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{ |
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$sig_t = ''; |
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$recid = ''; |
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if (!secp256k1_ecdsa_recoverable_signature_serialize_compact($this->ecAdapter->getContext(), $signature->getResource(), $sig_t, $recid)) { |
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throw new \RuntimeException('Secp256k1 serialize compact failure'); |
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} |
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return new Buffer(chr($signature->getFlags()) . $sig_t, 65, $this->ecAdapter->getMath()); |
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} |
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/** |
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* @param CompactSignatureInterface $signature |
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* @return BufferInterface |
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*/ |
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public function serialize(CompactSignatureInterface $signature): BufferInterface |
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{ |
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/** @var CompactSignature $signature */ |
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return $this->doSerialize($signature); |
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} |
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/** |
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* @param string|BufferInterface $data |
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* @return CompactSignatureInterface |
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*/ |
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public function parse($data): CompactSignatureInterface |
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{ |
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$math = $this->ecAdapter->getMath(); |
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$buffer = (new Parser($data, $math))->getBuffer(); |
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if ($buffer->getSize() !== 65) { |
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throw new \RuntimeException('Compact Sig must be 65 bytes'); |
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} |
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$byte = (int) $buffer->slice(0, 1)->getInt(); |
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$sig = $buffer->slice(1, 64); |
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$recoveryFlags = $byte - 27; |
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if ($recoveryFlags > 7) { |
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throw new \RuntimeException('Invalid signature type'); |
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} |
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$isCompressed = $math->cmp($math->bitwiseAnd(gmp_init($recoveryFlags), gmp_init(4)), gmp_init(0)) !== 0; |
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$recoveryId = $recoveryFlags - ($isCompressed ? 4 : 0); |
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$sig_t = ''; |
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/** @var resource $sig_t */ |
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if (!secp256k1_ecdsa_recoverable_signature_parse_compact($this->ecAdapter->getContext(), $sig_t, $sig->getBinary(), $recoveryId)) { |
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throw new \RuntimeException('Unable to parse compact signature'); |
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} |
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return new CompactSignature($this->ecAdapter, $sig_t, $recoveryId, $isCompressed); |
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} |
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} |
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Bit-Wasp /
bitcoin-php
